All-inclusive should mean a plan that includes all meals, drinks, tips, service charges, accommodations, some watersports ( usually non-motorized ), etc. NOT all plans are equal - be sure to inquire as to just what IS included and what is extra !
Other definition:
All-Inclusive is a hotel plan that usually includes all meals, drinks, tips, service charges, accommodations and some water sports.
A Canadian favourite.
Other definition:
All-inclusive is a resort providing accommodation, food and all facilities (eg. beach and watersports) internally, so that visitors have no need to leave the resort.
Other definition:
All-inclusive is a fixed-price package that includes all elements of the vacation. All-inclusive vacations usually include transportation, accommodations, meals, and sometimes sightseeing.
Other definition:
All-inclusive is a form of package holiday where the majority of services offered at the destination are included in the price paid prior to departure (e.g. refreshments, excursions, amenities, gratuities, etc).